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Estimation of safe post-operative fluid therapy in children
DOI 10.1186/ISRCTN43896775
ClinicalTrials.gov identifier
EudraCT number
Public title Estimation of safe post-operative fluid therapy in children
Scientific title The efficacy of hypotonic and near-isotonic saline for parenteral fluid therapy given at low maintenance rate in preventing significant change in plasma sodium in post-operative paediatric patients: a prospective randomised non-blinded study
Acronym N/A
Serial number at source Clinical Trial register database registry number (http://www.kctr.se): CT20110060
Study hypothesis Hyponatremia is the most frequent electrolyte abnormality observed in post-operative paediatric patients receiving intravenous maintenance fluid therapy. If plasma sodium concentration (p-Na+) declines to levels below 125 mmol/L in < 48 h, transient or permanent brain damage may occur.

There is an intense debate as to whether the administered volume (full rate vs. restricted rate of infusion) and the composition of solutions used for parenteral maintenance fluid therapy (hypotonic vs. isotonic solutions) contribute to the development of hyponatremia. Lines of evidence indicates that post-operative hyponatremia would be the result of dilution of body solutes, i.e. an excess of water in relation to the existing sodium stores rather than to an increase in urinary sodium excretion. This phenomenon might occur whenever antidiuretic hormone levels are increased, like in clinical conditions such as surgery.

Our hypothesis is that regardless of the parenteral fluid therapy to be administered, on the condition that the patientís extracellular fluid compartment is preserved and the urinary dilution capacity is suspected to be impaired by non-osmotic stimulated antidiuretic hormone activity, hyponatremia will not develop if fluid therapy is given at low maintenance rate i.e. approximately 3/4 of the average maintenance allowance.

Please note that as of 20/06/2011 the anticipated start and end dates of this trial have been updated. The previous dates were as follows:
Previous anticipated start date: 04/07/2011
Previous anticipated end date: 03/12/2012
Lay summary Not provided at time of registration
Ethics approval The study protocol has been approved by the Medical Ethics Committee at Karolinska University Hospital, Stockholm, Sweden on 1st November 2010, Protocol No. 2010/2:9
Study design Prospective randomised non-blinded study
Countries of recruitment Sweden
Disease/condition/study domain Emergency intervention for treatment of acute appendicitis in children and adolescents
Participants - inclusion criteria 1. Male and female children and adolescents aged between 1 and 14 years old whose post-operative p-Na+ are within the normal range (local reference range: 135 Ė 147 mmol/L)
2. Children and adolescents undergoing emergency intervention for treatment of acute appendicitis either as an open or laparoscopic procedure will be considered to be potentially eligible
To qualify for randomisation, the participants are required to have a complicated appendicitis, i.e. gangrenous or perforated, either with generalised or localised peritonitis of such a degree that the surgeon considers oral feeding unsuitable for at least 24 hours following the surgery. Consequently, the randomisation will be performed post-operatively and on the basis of intra-operative findings.

We infer that in our study population, the prescription of parenteral fluid therapy for the immediate 24 hours post-operative period might be justified and that by delaying oral fluid therapy intake, in any particular case, will do no harm to the patient.
Participants - exclusion criteria 1. Any clinical condition, such as renal disease, acute or chronic lung inflammation, pituitary or hypothalamic disease and adrenal insufficiency that eventually can lead to electrolyte and water imbalance
2. Any patient whose p-Na+ is < 130 mmol/L after the initiation of parenteral maintenance fluid therapy, will be withdrawn from the study and treated accordingly at the discretion of the anaesthesiologist responsible for the patientís care
Anticipated start date 01/11/2011
Anticipated end date 01/11/2012
Status of trial Stopped
Patient information material Not available in web format, please use the contact details below to request a patient information sheet
Target number of participants The number of patients per study arm needed to fulfill the power goal of the study will be 17 patients.
Interventions As of 19/04/2012 the status of this record was changed to 'stopped' due to low patient recruitment rate. The trial officially stopped on 18/04/2012.

Eligible patients will be randomly assigned to receive one of the following :
Eelectrolyte/glucose combinations as parenteral maintenance fluid therapies during the 24 h following surgery:
1. 0.23% sodium chloride (40 mmol/L Na+ + 20 mmol/L K+ + 60 mmol/L Cl­; extempore solution) in 5% glucose
2. 0.40% sodium chloride (70 mmol/L Na+ + 45 mmol/L Cl­ + 25 mmol/L acetate; B. Braun Melsungen AG, Melsungen, Germany) in 2.5% glucose
3. 0.81% sodium chloride (140 mmol/L Na+ + 4 mmol/L K+ + 1 mmol/L Ca2+ + 1 mmol/L Mg2+ + 118 mmol/L Cl­ + 30 mmol/L acetate; Serumwerk Bernburg AG, Bernburg, Germany) in 1% glucose (the chemical symbols K+, Cl-, Ca2+, and Mg2+ refer to potassium, chloride, calcium, and magnesium, respectively)

The fluid needs for parenteral therapy will be estimated based on metabolic requirements of the body, i.e. expenditure of energy, as described by Holliday and Segar where daily caloric expenditure is equal to 100 cal/kg BW up to 10 kg, 1000 cal + 50 cal/kg BW from 11 to 20 kg and 1500 cal + 20 cal/kg BW over 20 kg. Since prescription of intravenous fluid therapy given at full maintenance rate may be potentially dangerous when renal water excretion is limited by excess antidiuretic hormone, parenteral fluid therapy will be given at a lower rate than the recommended average maintenance rate. In accordance with our local care guidelines for parenteral fluid therapy following surgical procedures, approximately 3/4 of the average maintenance allowance, percentage of the average maintenance rate will be prescribed to all participants for the first 24 h post-operatively.

For further information regarding sample size calculation, which is based on an hypothetical condition, please contact rafael.krmar@ki.se
Primary outcome measure(s) To evaluate whether the post-operative prescription of either hypotonic (0.23% and 0.40% sodium chloride) or near-isotonic (0.81% sodium chloride) fluid therapy given at low maintenance rate in otherwise healthy children with normal post-operative p-Na+ are equally effective in maintaining p-Na+ within the normal range 24 h postoperatively
Secondary outcome measure(s) To determine water and electrolyte-balance during the administration of the investigational parenteral maintenance fluids as well as to investigate known regulatory hormones involved in the homeostatic control of water balance. We will also seek to determine how frequently p-Na+ should be monitored during the 24 h post-operative period.
Sources of funding Investigator initiated and funded (Sweden)
Trial website
Publications 2011 protocol in http://www.ncbi.nlm.nih.gov/pubmed/21729308
Contact name Dr  Rafael  Krmar
  Address Department of Pediatrics
Karolinska University Hospital, Huddinge
S-141 86 Stockholm
  City/town Stockholm
  Zip/Postcode S-141 86
  Country Sweden
  Email rafael.krmar@ki.se
Sponsor Karolinska University Hospital (Sweden)
  Address Department of Pediatric Anesthesia and Intensive Care, ALB, Karolinska University Hospital, Solna.
  City/town Stockholm
  Zip/Postcode S-171 76
  Country Sweden
Date applied 25/02/2011
Last edited 19/04/2012
Date ISRCTN assigned 17/03/2011
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